EL-FASSI, I.- iddine. On the superstability of generalized d’Alembert harmonic functions. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 15, p. 5–13, 2016. Disponível em: https://studmath.uken.krakow.pl/article/view/13138. Acesso em: 31 oct. 2026.